MAP_OBJECT

MAP_OBJECT displays the hierarchical arrangement of storage containers for objects. Each row in the table represents a level in the hierarchy.

Column	Datatype	NULL	Description
OBJECT_NAME	VARCHAR2(2000)		Name of the object
OBJECT_OWNER	VARCHAR2(2000)		Owner of the object
OBJECT_TYPE	VARCHAR2(2000)		Object type
FILE_MAP_IDX	NUMBER		File index (corresponds to FILE_MAP_IDX in V$MAP_FILE)
DEPTH	NUMBER		Element depth within the I/O stack
ELEM_IDX	NUMBER		Index corresponding to the element
CU_SIZE	NUMBER		Contiguous set of logical blocks of the file (in HKB units) that is resident contiguously on the element
STRIDE	NUMBER		Number of HKB between contiguous units (CU) in the file that are contiguous on this element. Used in RAID5 and striped files.
NUM_CU	NUMBER		Number of contiguous units that are adjacent to each other on this element that are separated by STRIDE HKB in the file. In RAID5, the number of contiguous units also include the parity stripes.
ELEM_OFFSET	NUMBER		Element offset (in HKB units)
FILE_OFFSET	NUMBER		Offset (in HKB units) from the start of the file to the first byte of the contiguous units
DATA_TYPE	VARCHAR2(2000)		Datatype (DATA, PARITY, or DATA AND PARITY)
PARITY_POS	NUMBER		Position of the parity. Only for RAID5. This field is needed to distinguish the parity from the data part.
PARITY_PERIOD	NUMBER		Parity period. Only for RAID5.

Oracle data dictionary views

Oracle dynamic performance views